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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91358d011c985ce25ffbbe2ab3e5407fc05512f74eacf88ee28ae01cc9b4dcad' 
  AND token = 'guJcmWAy/EQkarLJRo+x8EFQPuOpZFNvi+6spkx2IXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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