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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba36290f0e19ec076c2f3720dc749574fa454bc52293a8f2d74f48ce7b6312c' 
  AND token = 'ODTzRReiQk/JQb/k/xDlDLwaLSpGvhL5O94pdyHGhjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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