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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b30563a4dfd59418233eceba541688a8f9b78d7197d6a85809245958032869' 
  AND token = 'kee3NrkvyFdP2es/+gViZJmjqWrEBn0gFX4ijNLVr10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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