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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4511102efc96aaef2645510aa07175682ed3d0cc21fc0d13fb4e95c589b12afa' 
  AND token = 'MBJ9plkNdzmvzP1pYgaXm+jpItMyqbfdxa5K2+SZwPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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