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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac60854aff268e5b35881d49e02fb4e24ca167e52a9000566eadc840d70eb044' 
  AND token = 'v/jeLmlsc4K/+ojB+C/+eZpRZsl/QqC1M65+9oypmQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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