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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32e82a83b14f023a4411406e57be88a2b0b2a7329bb7ba428ae260b220b5003' 
  AND token = 'Cq/IBswG/A918J9lSnVi/w5hE6JP8+zZaF+z2kZXvAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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