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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991588d7d9df1ef8cb78feef791c53f7148f2f71676c157edab77c05d31077fd' 
  AND token = 'lL1aVrrOObPjM/uPhaS7Z/LS65ePFtUhoFDxEhy3+a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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