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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9a672d3ae2ddd0e60f8dcfb197e95bb284217ea413428374e53db5cc12bee5' 
  AND token = '5Lyr473+PI1ySAhz82quNU00thBLpoU3rmROJ/5Lj7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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