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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef20709c53ec3adedd64aeebbf93b400933b5ecd9247886813916e4f9f3d832' 
  AND token = 'OIaBnhroGYak2U/k4XtdSMhUU4DtIRdLzTXTymfl5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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