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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc820325507b3fcd8632c222f37fcc006d14fcb18ebcc101380bc41cb751a1c' 
  AND token = 'GN7z5Q0BFxlMJn0SE5/0se8t5WGDb8FL8orpsfD242k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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