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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1c6057931bd3d00fdf63912f53cc834ba13fdd63d526d38c0ab0244c922daf' 
  AND token = '+y9EC89xUsLFRoDLUpC5sNse/873xCuFJ/Mv5riL7q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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