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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e2996eb5f9c225e39bc50b6b3806576e007d0f5a514d0ccc137a9bb98156f' 
  AND token = 'IYIO7urhi9+INYK9ZgEjWO+CwfqhI4jsZqHkUTuAdj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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