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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff908dcdea10d6f831fc5d593d12e65415e1c0d416d097c200ef6497484476d3' 
  AND token = 'oeAWnBhwN/F0QGP+X+28L1CMPtvHJ7YSbQiYTD7BQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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