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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f606b9df2ae57243e92e12f0ad5a02e6a2f42dfca92d339f2d871946721ee95a' 
  AND token = 'NVtWjP4EXl31x3leqGgc+nClJDfRJLyj1cCNfiD3EMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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