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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bfa7f4141b3a2c3cdf8200625269657950b29b68732fc6d0a036a86d72e25e' 
  AND token = 'FmVPhL2HsxtKDIz5Nhq+87qz7aPhFFMmsW9ZVBedtII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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