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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bb58ccdd95c49b32b1b15456227d2f0014f5724c592b0c779e57f2009fecfe' 
  AND token = 'vKTu1XnExW/TxcEWfkpDm8zCTU0KGUNiFKrDC+EYMYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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