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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a636c47eb52f32735b85765eb668c0b857f2fb757371738bea129a226bd803b5' 
  AND token = '8K9SCXSp3lx915qoJPacRuj6imCoPwZ1ljEcX7/qM4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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