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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c99e6aa0a7af27cee77b2b2a8ad8b1ec96d20491e7052d94d1d13abf796b7b' 
  AND token = 'givSq+PZPAbGj+/Eg31IS79AVn2RPLXLIc9v0tkqG1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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