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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2b2a428acf71eca519b3e9f15eb52feaf0b0c38a4b1dc916cab19dddb5493d' 
  AND token = 'MG0Gqn6XkF+tfiKQEUjr2I/IlCoU1pp+MyCo8wtVCPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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