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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e301c63ac4a98f9bfc377e0aad00a1c3b2e5439129275968bb860cb52e919890' 
  AND token = 'wA56njYP38u3vzmEUgvWji9SV+G00do2rtzrmNzf5TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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