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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fada9f84df925f2d574321cb9decf66bfa678645c3dc0245272dc1c82d3776e' 
  AND token = 'QX8d7iAOCOJLkBe68eRqcY5oFou/OJ59IBhR+jyUML4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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