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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d09bf18e1e707b423b33022f8826a66c494840af726f6a877e7e25c9a877bf' 
  AND token = 'ZNe7N99fF+4VfR7Kj6In/3gYBDf3tQvKPCL+ps9+91Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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