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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a173db8e591c5e05a50a2bb11d433963082cabff3f47cecdd946555800012eb' 
  AND token = '8QzBsRtev7VZ2lbqo6cndIlPup94IJB5Lk9NKq2PF8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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