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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f536f194b91dca75babf253b2c909b1125fac49392e32821b51d7d2ccce68db8' 
  AND token = 'NvwDNDPVEYgQ3CPP8Dehe0JQHv0VvEwLAwDj9U7+G8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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