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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4851c12bdb8caf6179982035821389f33118828e91207812a16ff1f623aaf5e' 
  AND token = 'oeaIyqk5Cm3ShpbVEy6ZVUhfFPiW4igEbnb4tEexjfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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