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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514fd8abf16a88d13052313f022180adc6c8ab1ffb3c9e7b47904d2eb4268282' 
  AND token = 'EgpGET5pYRhUp34czBFmnCetQDXQptMOeBu68poF+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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