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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32abb92faa70a089c4f7fc643d0f61de012c98a1e9ccc313027670b571ebdc44' 
  AND token = 'sqSoPtTnAnaj6Cl2lVfSh08Ll26+7pgatNUzu/hXEFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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