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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76169663d46e6f16608a56a51c157d628eed303953114961d53273ac1e9f2379' 
  AND token = 'RqrGPhdCONDWYjAviolbKPMuEC9fwd+zbJdyLm6+0og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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