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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73193c9c6b8b0a1e09040de69e8811fd2f89f77ae3cacbd2571240f8fddd82d' 
  AND token = 'DfQygQoldXRH1WwlhbT/BMb+BVNBNBWIpeOK3izDHn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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