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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261e9a8cb403440c16b8296f2779d46529fae06b4f0478b92800e5653f0b214c' 
  AND token = 'ABF+MKIT9pcLwMfx0w7B2SUhvF3P5me2al+Pgzmnhbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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