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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6cb4b4fb1f16ddac48c74738535adb163590fc5ff24f5f288e25496a2fe122' 
  AND token = 'pgTDtw5jEPBoYskNbM34s1zOqxfStOt6sZHaNXhuFSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}