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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f4ec8b71ad2c9a771235a838facb051f26c68cb7d5da2ec18a13d2e5d77dc8' 
  AND token = 'X//J0ZQ8gVO/kJA7AxpWEc3GwrLV9kew/aeEg1C77qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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