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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380a0fb04a22ce17534cd8093ca1cb94ae88908900ca17c59ac8dc3ef0828cfc' 
  AND token = 'x4M5hhaqbQluqhzTQ70uWBvOPvnTY1dgsqO6Pg70HHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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