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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5f770d42f5646b3423853961cd5f5fa7220433eb35837dc42af7e46abce1a7' 
  AND token = 'B4fFJ3Ye3H1uyerOxcnEcVOMgwMUNauxuanvyIQjzr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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