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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89137548c3df4ab5d8c8eb0d4af59639d7185ebfad2681475c182833a3066136' 
  AND token = 'YQLNmG6aL+F+BHCPfhaRU0dO8uo4liZBIRyG+y5EhJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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