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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564d72475b66674e060b1b548af1bfbddca9d3ad168234952ec57e2a9119e6b0' 
  AND token = 'wt7x+5Ni3MseJlyuMY2YSNhfLx0VdFz26OH9RKygoF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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