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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccda489a7995ba0395b5b2813d5a931059ce231f86a42375e761619259127db5' 
  AND token = 'Bfy7rVnl5U3LhKuEJ/KrcxVb2Bg+WOrKg1/R+UEowiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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