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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbf30df92dd783c7238a8ea6a1750325baac4e49687a4c2defd0b4fe2b43364' 
  AND token = 'cir5TlSugQl7BVe0YXVOEBC3D8O09n6sYIdRIPZysPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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