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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90c75975bcac6423817d6fa01cffcd4832850cb86f7b019b50acff4848acc26' 
  AND token = 'He5wYYE5NCHXsni/4wf55tBxTMnKD0RR3x/hEA3Zy7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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