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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b2db160c5c3c0e60036762dce94ebbf8789283cb7119316c1d76610522726e' 
  AND token = 'YV7xb6U6EnpZRXGdUphVtSpssF6n0o8q6SG0DGyaF8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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