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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abdebc39a190cefcd757b30dd468f6bdb2212e5744e6024df301b4a27f9fe3b' 
  AND token = 'P8yicry8Sw7Lf78V6mU6+3Rz+TsRBd+8Qe8LxmYl+eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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