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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda2eb425782e3ff4204e02e74ac2bc477f5137ad7096453fff42820e11df46d' 
  AND token = 'R1wO+n4jrWAmFEveqThw/PnXqu/LnFgtF2sIU5JuHQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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