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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a62af02fbd3b16b3dfcf747b47e1545114e305125b5f3134cbdbe38a80dec19' 
  AND token = 'xAPYKwEqfQ6PKdYEOJcRZ3fCPp516NCbaGa6KD2X6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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