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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d20b712b92654e8fbd8ea4972f461f3ca40ae5cd371abb470d6e0cae7dadf8' 
  AND token = 'OigAuIYC1S8ROxMD3DXpLMSeAV59PZ9mEPegEMalMKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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