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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df037853c98a0268c2a9b1ff355f5516719be6ee5a06aa8b30a64dab84dea4c' 
  AND token = 'gl8ofgLul/Zks2fOcY6PtIn0gylUtI8cuDm1K1+Ye80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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