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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95af36bb1a596d3745ae33d4ee490f3c8c12c6e09b5941d4bf8f761953eed30' 
  AND token = 'gKiUdiiFuQX2cNpCjkCJ6deSXgcPJmeGNm7vB8L0GXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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