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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985f1d3969661bd9c900da9f3239f4510bd7d524ae219f6c5e373ff8070510a' 
  AND token = 'i2Q3f+AGZskpVYUgmtKCNeLCFuxU0Jt19DEFEabgE/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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