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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b08ac31f3ec3dc4e5152d6fa3ecf478abd0d57c5e34472ed5e4d3d98fa2eda9' 
  AND token = 'iEJQRkDSAO6kPQfC2dGppQEt65ugmlS6fleeRjWAyos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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