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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a3dcec311bfe2917282eb2a17282c1143c9cf93406ed63e6c319d19a65591a' 
  AND token = '/2RU085KjW/ZJLLB+uf6w+Z1xnR/6z1FIdNuvmT1ZTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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