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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575078fd7df8ba946f7836e904c0e17c05bad8985b630a8b96e80e90cd08eae7' 
  AND token = 'IoRmBfF/NAMR599Ey9it5vInnIRioHnqdjSU0h4FBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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