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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bac9221fe7bc9dd7e7c9659c106c10fef1ae0d020fff47df09a202cd0932e4' 
  AND token = '4Xnp6dTwvR2NrsB0ooYwPTFJIbzbfgntKEnV6eobsvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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