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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb0a45fb3783f891cc8804d62aeb9d23f1c5200f19eccf0168fd4935239515c' 
  AND token = 'JcqvD52cs8djAc92aE+P+epPRkB3DGYkHkYw3J3ijlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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