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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464265de45ff77bd63354f35851dbfe4ac264646a350ee4c2ee1c9d44e934755' 
  AND token = 'i/sAVWHxbGuaCGRQKREljc+Jx21GaSPf3auowLR/HAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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